confusion might occur, they are listed under both 

 words. As an ilkistration, water az'ciis may be looked 

 for under W and under A, but yellow avcns would 

 appear under A, only, while yellow-root would appear 

 under Y. In writing the compound words which make 

 up the names of so many plants, it has been impossible 

 to lay dow'U rules that will govern all cases. The best 

 authorities,themseh'es, do not agree in such matters. 

 Guided somewdiat by common usage we have wTitten 

 them according to our idea of the closeness of their 

 meaning, either as tW'O separate w-ords, tw^o words 

 hyphenated or two words written as one. 



The area covered ])y this list is that included by 

 Gray's Manual, 7th edition, which may, for our pur- 

 poses,be said to extend from the Mississippi and Ohio 

 rivers, north and east. The nomenclature is that of 

 the volume mentioned which conforms to the Vienna 

 Code, universally recognized as standard in such mat- 

 ters. Since the citation of this volume leaves no doubt 

 as to the species meant, it has been possible to omit all 

 author-citations. 



Although great pains have been taken to avoid er- 

 rors, it is unfortunately true that several have crept in. 

 Those that w^e have discovered are corrected in the 

 final pages, but if others are discovered by tliose who 

 consult this book, the author would appreciate having 

 his attention called to them. With a view to making 

 this list as nearly complete as possible, he will also wel- 

 come notice of any genuine vernacular names that ma}- 

 have been omitted. 



Johet, Mar. 31, 1923. 



